I bought mine from Ritz here. I bought another D200 from Adorama here.
Also try Amazon here. Adorama usually has D200/18-70 kits in stock here. It helps me keep adding to this site when you click these links to get yours.

This is a completely
different topic than the noise and grain seen on my noise page.

My D200 is spectacular for ridiculously long night exposures.

Long
exposure noise reduction (NR) lets the camera make
a second identical exposure with the shutter closed.
This lets the camera know exactly which pixels are
hot and exactly how much fog (leakage) there is. The
camera then subtracts the dark frame image from the
shot you just made and saves the result.
Engineers call this Dark Frame Subtraction.

Even when set to ON it doesn't activate until exposures
are 10s or longer. It does reduce the shot buffer from
25 to 11 JPGs regardless of shutter speed, so check this
if your shot buffer just shrunk.

My
D70 and D1H always fogged one edge very slightly purple
from charge leakage if you made a 30 second exposure
at ISO 1600. The Long Exposure NR setting would fix
this, but takes as much longer again as the exposure
time to correct.

Good news: My
D200 has much less, if any, purple haze. I see no reason
to use the Long Exposure NR even if you are photographing
coal mines.

Long
Exposure NR is a pain. The second dark exposure is
as long as the main exposure. That means you have
to wait an extra four minutes after making a four minute
exposure if you set LONG EXP NR ON.

Further
down I'm going to show you what happens in extreme
examples of long exposures at high ISOs. Please note
that only crazy people will ever do this. My shot of
the stars above was made at LV -2.3, or six stops less
than the first dark fog examples. I didn't bother with
Long Exposure NR and left it OFF, its default. The
last dark examples at four minutes are more ten stops
more exposure than needed to shoot a landscape under
the full moon.

30 seconds at
ISO 1600 at f/1.4 is LV -8.
This is seven stops more exposure than used in the moonlight shot above.
I've never seen this purple haze in real photography. I only see it
in test exposures of my lens cap. Therefore I never bother waiting
for the Long Exposure NR and always keep it off, which is the default.

D70:
ISO 1600, 30 seconds.

D200:
ISO 1600, 30 seconds.

These are actual
shots. Pretty boring! There is a very slight purple haze in the upper
left of the D70 shot. The D200 looks better. Since you can't see anything
here I'll lighten them both for you. I did this by dragging the right
highlight slider in PhotoShop's Level tool from 255 all the way over
to 32 for both images. This is equivalent to lightening these images
by four stops, or LV -12. A few more stops would let you expose a barren
landscape lit by nothing but starlight.

D70,
lightened four stops to ISO 25,600

D200,
lightened four stops to ISO 25,600

Clearly the D200
works great. It's as clear as the file number of my D200 file I show
above: 5150. 5150 is the LAPD code
for "insane," which is how I feel about wieners who spend
their time making time exposures of lens caps. I can show the haze
of the D70 making these time exposures of lens caps, but even the D70
is great for any real night photography. Noise is never an issue with
either of these for me.

You'll often
see a couple of hot pixels in the D200 at ISO 1600 or ISO 3200. These
are easy to fix in Photoshop. The Long Exposure NR function also
fixes them, but takes a lot more time waiting to complete for each
shot.

Note that even at these levels it's only the D70 that shows
any haze. The D200 is perfect.

Four Minute
(256 second) Exposures at High ISOs

Aren't you all glad I spend my time making time exposures
of lens caps for you?

These photos
make it pretty plain to me that you can forget long exposure NR. You
get fogging with four minute exposures at ISO 1600 and 3200, but at
f/1.4 these correspond to to LV -11 and LV -12. If you're crazy enough
to do this at least you can see what my D200 does.

There are some
dim red sparkles (hot pixels) at 3200 and 1600 if you look at
100%. They go away completely with Long Exp NR ON.

I lightened
the four minutes at ISO 1600 long NR ON shot four stops. That makes
this a four minute exposure at ISO 25,600! I did this by dragging
the right highlight slider in PhotoShop's Level tool from 255 all the
way over to 32. This is equivalent to LV -15 at f/1.4. This is enough
exposure to make a landscape lit by nothing but starlight (no moon)
look as bright as day. This looks pretty good to me! Remember these
are just shots of the back of my lens cap.

Technical Note

A photographic
minute is 64 seconds long. Four photographic minutes are 256 seconds,
or 4:16 on the clock. This is because photographic time works in powers
of two. For instance, 1/1,000 second is actually 1/1,024 if you get
out your shutter timer.